To temporarily bypass the problem you can do a system restore to a date before you started having the problem.
If that does not work, boot to safe mode after downloading and installing
HijackThis. Start Hijack this software (utility to modify registry values) and scroll down registry entries to the line that says “
020 - Winlogon Nofity: Wgalogon - …” select it, and click
fix checked.
If you think that your isystem is counterfeit and you had been victim of a scam you should contact the person that sold you the computer, and then contact Microsoft.
See
Microsoft Help and Support.
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